Ascend Archive
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Re: (ASCEND) 2 Channel leased line with P50
On Thu, Jun 25, 1998 at 05:36:18PM +0200, Hubert Felber wrote:
>
> Welcome to the club.
This club was closed with 6.x ;)
> Ascend does not support 2-channel links with a p50.
They do.
> We tried this a lot of time without success, then we gave up.
> See http://www.ascend.de/d64s.htm.
> Maybe you contact Ascend Germany for further information.
You have two options:
1) SuperDig128
Aka low level B-channel bundling in a S0 frame (likely B1B2B1B2)
to get a 128kbps aggregate. This _can_ work with D64S2, but it as
well _can_ fail. The reason that it almost always fails is the sense
of correctness and order at the -T-- which always uses two Bs from
a PCM30 which are "besides each other". Due to the real picture of
the PCM30 modules (two columns of 15 rows, TS 1..15 left and 17..31
right) this introduces a delay of the second channel which is a bit
larger than half an octet time, causing a non octet synchronous bundle.
Short spoken - "Try it out" (Michael Faraday).
2) Leased/Leased
This was finally fixed to be available in 6.x and it works. Due to
specific Ascend weirdness it is only possible to use it with Nailed/Mpp
(to be able to specify Group=1,2), while anybody else would think this
should work starting with MP.
Conclusio:
There _is_ a problem - if you go cross-platform. Cisco AFAIK neither
can use B1B2B1B2 bundling nor can it use MP+. But I have read on this
list that people successfully negotiated MP between a Cisco and a
P50 running Leased/Leased + Nailed/Mpp. So even that seems possible.
An"I know a Haiku on SuperDig128"dre.
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